/Engine/Plugins/Runtime/MeshModelingToolset/Source/MeshModelingTools/Public/EditMeshPolygonsTool.h
Wraps a FDynamicMeshChange so that it can be expired and so that other data structures in the tool can be updated. On apply/revert, the topology is rebuilt using stored extra corner vids.
class FEditMeshPolygonsToolMeshChange : public [FToolCommandChange](API\Runtime\InteractiveToolsFramework\FToolCommandChange)
TSet< int32 >
ExtraCornerVidsAfter
TSet< int32 >
ExtraCornerVidsBefore
TUniquePtr<UE:...
MeshChange